DLC Quest/YMMV

• Memetic Mutation: Late in the game, a large troll blocks your way and has this to ask you upon failing to wound him with your sword.

Troll: "Problem?"

• Unwinnable by Insanity: Actually grinding at the grindstone manually without buying the DLC leaves you with some extra cash, which you can use to buy things other than the Double Jump Pack when it's needed to get enough coins to actually finish the game. Soon, you will have no money to even buy the pack and be unable to access the ending.